Permanent Marking on Metal

Permanent marking on metal, whether stainless steel, aluminum, titanium, brass, or copper, presents a couple of unique challenges but can be accomplished in a number of ways.

When you're looking to make a permanent mark on metal, there are a few options for how the mark can be achieved. Any marking method that removes part of the metal to create the mark will be an option. This includes etching and engraving methods.

Surface marking methods are also options, although they typically rely on durable, long-lasting ink being applied to the surface, which can be somewhat cumbersome and is not always ideal for harsher applications.

Which Method to Choose?

The type of metal being marked will sometimes dictate which marking method is best. For instance, while very hard metals could be stamped with an impact press package, a more effective solution might be a laser marking system depending on your specific requirements.

Or, the application requirements can dictate which marking method to choose. Permanent marking on metal fabrications that will be exposed to corrosive chemicals or harsh environments might be better suited to the types of deep marks made by steel type rather than the surface marks of an inkjet printer.

Ultimately, the best solution will come down to several factors, including the material, application, budget, and time restraints (if any).

So, let’s look at the three basic types of marking methods that can be used for permanent marking on metal.

Etching

Etching can be accomplished with several methods, but each relies on disturbing the surface of the metal to a noticeable depth. The change in surface properties shows a contrast, which is the visible mark.

The most common etching methods include:

• CNC marking tools
• Hand-held marking tools

Engraving

Much like etching, engraving relies on displacing the surface of the metal. When engraving or stamping, however, a much deeper mark is made on the surface.

Engraving and stamping are ideal solutions for applications that will be subject to harsh environments and parts that will be subject to paintings or coatings.

Common engraving methods include:

• Impact presses
• Steel type and holders
• Steel stamps and dies 
• Hand-held marking tools
• Numbering heads

Surface Marking

Surface marking typically doesn't remove any surface material; instead, this type of marking method adds ink, paint, or foil to the surface of the material.

Common surface marking methods include:

• Industrial inks
• Inkjet printing
• Hot stamping
• Stencils

For more information about custom dies, stamps, inserts, marking machines, industrial inks, inkjet printers, or to request a quote, please contact us here.